135136221 has 8 divisors (see below), whose sum is σ = 196561824. Its totient is φ = 81900720.

The previous prime is 135136219. The next prime is 135136249. The reversal of 135136221 is 122631531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 135136221 - 2¹ = 135136219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135136191 and 135136200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135136121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2047486 + ... + 2047551.

It is an arithmetic number, because the mean of its divisors is an integer number (24570228).

Almost surely, 2^135136221 is an apocalyptic number.

135136221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

135136221 is a deficient number, since it is larger than the sum of its proper divisors (61425603).

135136221 is a wasteful number, since it uses less digits than its factorization.

135136221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4095051.

The product of its digits is 1080, while the sum is 24.

The square root of 135136221 is about 11624.8105791019. The cubic root of 135136221 is about 513.1652701735.

Adding to 135136221 its reverse (122631531), we get a palindrome (257767752).

The spelling of 135136221 in words is "one hundred thirty-five million, one hundred thirty-six thousand, two hundred twenty-one".